PX TrawlEye Configurator dialog box
When you configure a PX TrawlEye sensor, you can select key parameters related to its echo sounder, check its battery status or even configure some special features like the learn mode.
Prerequisites
The PX TrawlEye Configurator dialog box is only available if there is a PX TrawlEye connected to your TV80 by means of the configurator cable. Some features of the PX TrawlEye Configurator dialog box will vary according to the SW version of the sensor itself.
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Description
Gear monitoring sensors are delivered from Kongsberg Discovery readily set up with common default settings. In some cases, you may find that the default parameters do not suit your operational needs. Each individual sensor can be configured to specify its communication channel, which measurements to make and some other relevant operating parameters.
Details
This dialog box presents a number of parameters that are common to all Configuration dialog boxes and some that are specific to the type of sensor connected.
The details provided here are specific to configure this sensor.
Vertical resolution
You can control the vertical resolution of the echogram. The vertical resolution of a PX TrawlEye is related to the number of vertical “pixels” sent from the sensor for each ping. By default, the value is “High”. If you want a 0.5s update rate, you must choose “Low” vertical solution.
Range
The Range parameter defines how “far” you want the TrawlEye to detect echoes. The range is defined from a selected start range, and down to a value less than the current bottom depth or a distance in horizontal direction in the water. A better resolution is achieved using the shorter ranges.
With a trawl opening of 5–6 meters, you should select a 10m or 15m range value.
If you want to configure a PX TrawlEye sensor that is version 2.12 or higher, you can select a dual range. With dual range, 50% of the echogram resolution is used on the first 5, 10, 15 or 20 meters; the rest of the resolution is used on the rest of the echogram: that is 95, 90, 85 or 80 meters.
Pulse Duration
The Pulse Duration setting specifies the current duration ("length") of the transmitted pulse. The duration ("length") of your transmitted pulse is very important to how you can detect fish. The pulse duration can be selected according to the current range and what kind of targets you are looking at.
•  A short pulse duration gives you a very fine vertical resolution.
•  A long pulse duration throws a lot more energy into the water, and the digital filters used by the receiver are narrower.
In shallow waters a short pulse duration is used and in deeper waters a longer pulse duration is more useful.
The shorter pulses offer a higher resolution and a shorter blanking zone, but they are more affected by noise. We recommend using short pulse length on low trawls, in the tunnel and at the cod end.
The pulse lengths 512µ, 1024µs and 2018µs use FM sweep (Chirp) technology and give high resolution even if the pulse length is long. However, the longest the pulse, the largest the blanking zone. We recommend using 512µs (default value) and longer pulses on trawls from 15m and more height
TVG
The purpose of the TVG compensation is to make targets of the same size produce echoes of the same size, regardless of the range. Time Variable Gain (TVG) is applied to the echo signals before they are displayed. The TV80 system can work with several different TVG compensation settings. The default value is shown with an asterisk.
Signals received from long ranges are amplified to compensate for losses due to geometric spread and absorption. By means of algorithms, the time variable gain compensation converts the echo presentation as a function of range. This makes the targets with the same strength appear with the same intensity independent of their physical distance from the transducer.
Gain
The purpose of the Gain function is to adjust the echo level in the display presentations. By adjusting the gain you can control how much amplification the TV80 system applies to the received echoes. In combination with TVG value, select the best setting for your fishing scenario. 10 is the default value.
Gain is a linear function.
Offset
Offset can be very useful if you are more interested on details from, for example, the centre of the trawl and down to the bottom rather than the whole trawl opening. Instead of having the echogram starting from the sensor, you make it start from a distance from the sensor. This parameter will help you focus on the part of the trawl that is most important for you. Do not confuse this parameter with the one specifically related to a measurement.
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Measurements
Select the measurements you want to receive from your PX TrawlEye. The number of measurements available will be limited by the SW version of your sensor and/or on your selection of the Learn Mode parameters. When enabled, the sensor will send the requested measurements.
When the PX TrawlEye sensor is equipped with a Depth/Temperature lid, and the depth measurement is selected, the echogram can be visualized in true motion.
Priority
Selecting Priority will allow the selected measurement to be transmitted after every other measurement.
Learn mode
Before configuring the PX TrawlEye sensor for your operating needs, you can test different settings. This will help you save a lot of operative time and will make you obtain accurate data right from the beginning. If Learn mode is enabled the PX TrawlEye sensor will run through the learn parameters you select for the ping-period you select in the ping interval. The data from Learn mode is shown on the Extras menu whenever the sensor is sending that information.
Note
Learn parameter 1; Pulse Length and Learn Parameter 2; TVG. Ping interval: 60. The PX TrawlEye will start with pulse length 64µs and TVG 20 and use this setting for 60 pings, then the TrawlEye will keep 64µs, but change TVG to 30 for the next 60 pings, then 64µs and TVG 35 for 60 pings and then 64µs and TVG40 for 60 pings. The TrawlEye will then change pulse length to 128µs and TVG to 20 and run through all TVGs with this pulse length. After 2048µs and TVG 40 has been pinging 60 times the TrawlEye will start over with 64µs and TVG 20 and run through all settings again and again until you take it up and configure the sensor to the preferred settings you found during the Learn mode
Note
The configuration of TrawlEye’s Learn Mode is not officially supported in TV80 version 23.11.
Ping Interval
The Ping Interval function permits you to choose the time (in milliseconds) between each transmission ("ping"). Specify the interval between each ping.